Lyrics have been posted at:
https://mudcat.org/thread.cfm?threadid=131599 (Mudcat.org) with a link to a scan of the music as well.
Lyrics copied from that site:
RED SOMBRERO
(Peter Hutchings)
I wear a red sombrero,
It is a big sombrero.
I only wear it
Because the sunshine
Gets in my eyes and I cannot see at all.
I have a little donkey,
He is a happy donkey.
He always takes me
Into the market
When I go shopping
To buy some food and wine.
I have a stripey blanket,
It is a coloured blanket.
It keeps me nice and
Warm in the night time
When I am sleeping
Under the silver moon.
I wear a red sombrero,
It is a big sombrero.
I only wear it
Because the sunshine
Gets in my eyes and I cannot see at all.
My sombrero is the biggest hat in the world.